* Note that in the ill-conditioned case, a selected complex
* eigenvalue may no longer satisfy SELCTG(ALPHAR(j),ALPHAI(j),
* BETA(j)) = .TRUE. after ordering. INFO is to be set to N+2
* in this case.
Harden xLASCL against infinite and NaN inputs.
xLASCL will fall into an infinite loop with infinite and NaN inputs.
While those inputs *should* never happen, the code should terminate
if they do.
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